Uni-Ball Uni Pin Technical Drawing Pen Brush Nib Pack of 12 Fineliner Pens from Uni-Ball. Uni Ball's world-renowned Pin fineliner perfect for high precision. Uni's high quality ""Super Ink"" is not only water and light resistant, but also ""Tamper-Resistant"", meaning that the ink can not be washed of using chemicals and solutions used by people to fraudulently modify documents. With their steel tips, the Pin range offers an extended lifespan when compared with cheaper imitations. With their huge range of nibs, the Uni Pin range is ideal for artists, illustrators, and designers of all ability levels. Set contains twelve Light Grey coloured pens, with a Brush nib. The highly economical Uni Pin drawing pen features waterproof and fadeproof pigment ink. Ideal for all types of art and design, including sketching and technical drawing, the steel-supported polyacetal nib is available in a range of line widths. Metal surround protects the nib and makes these pens suitable for use with stencils. Light grey ink - part of Uni's Super Ink range - fade-resistant, water-resistant and tamper-proof.